Select tool could work as Autocad does. If you drag to the right, the selection will only get full objects (you need to fit all the object in the selection area); if you drag to the left you can select an object just fitting a small part of it (you select all object, but you don't need to make it fit all). For example, I have a line, if I try to select it dragging from left to right, I will select it only if I draw a selection area bigger than the line, but, if I drag from right to left, just a small selection of the line will be enough to select all the object